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Waveform and Spectrogram Image
Turn audio into waveform art or a spectrogram, as PNG or SVG.
Free, no uploads, no sign-up. Runs 100% in your browser.
How Waveform and Spectrogram Image works
Loudness is measured from the decoded samples and drawn as SVG. The spectrogram uses a short-time Fourier transform on a canvas. All on your device.
Input: MP3, WAV, M4A, OGG, FLAC, MP4. Output: PNG, SVG.
How to use Waveform and Spectrogram Image
- Drop an audio file onto Waveform and Spectrogram Image (or start recording).
- Adjust the options and preview playback.
- Process the audio.
- Download in the format you picked.
Tips
- WAV is lossless but large; MP3/AAC/OGG are compact for sharing.
- Engines load on first use and are cached afterwards.
Waveform and Spectrogram Image FAQ
- Are my files uploaded?
- No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.
- Is it free? Are there limits or watermarks?
- Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.
- Does it work offline?
- Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.
Related tools
- Audio to Video Visualizer: Turn a song or podcast clip into an MP4 with cover art and a moving waveform or spectrum.
- Audio Editor & Trimmer: Trim, fade in/out, change volume and export with a waveform.
- Volume Booster and Normalizer: Make quiet audio or video louder, or even out loudness to a standard level (EBU R128).
- Audio Converter: Convert MP3, WAV, OGG, AAC, FLAC and M4A.